society > travel > travel by water > vessel, ship, or boat > equipment of vessel > tackle or purchase > [noun] > system of) pulley(s) > specific forms of block
1788 6 207 A rope passing over the shieve of a notch block.
1846 A. Young 38 Snatch-Blocks (or Notch-Blocks) which are single blocks with a notch cut in one cheek, to receive the bight of a rope.